Let the day/night transform actually fire

EntityAITransform claimed the PASSIVE mutex, so any running movement or look
task blocked it from ever starting. The swap only happened in the gaps where
those yielded - which is why it appeared to trigger when an NPC said a line and
for a moment afterwards. The task only polls world time and flips the state, so
it needs no mutex at all.

src/main/java/noppes/npcs/ai/EntityAITransform.java

@@ -10,7 +10,10 @@ public class EntityAITransform extends EntityAIBase {
 
     public EntityAITransform(EntityNPCInterface npc) {
         this.npc = npc;
-        setMutexBits(AiMutex.PASSIVE);
+        // No mutex: this only polls the world time and flips the transform, it drives nothing.
+        // Claiming PASSIVE let any running movement or look task starve it, so the day/night
+        // swap only fired in the gaps where those yielded - such as while saying a line.
+        setMutexBits(0);
     }
 
     @Override